Tandem sub



FIG. 1 is a first perspective view of a tandem sub, showing our new design.

FIG. 2 is second perspective view of the tandem sub of FIG. 1 , shown from a different angle, and from an end opposite that of FIG. 1 .

FIG. 3 is a top plan view thereof.

FIG. 4 is a bottom plan view thereof.

FIG. 5 is a right side elevation view thereof.

FIG. 6 is a left side elevation view thereof.

FIG. 7 is a front plan view of the tandem sub of FIG. 1 ; and,

FIG. 8 is a rear plan view thereof.

The broken lines in the drawings depict portions of the tandem sub that form no part of the claimed designs. 

CLAIM The ornamental design for a tandem sub, as shown and described. 